I guess by your handle you have an 83.
I have an 86, same set up, RWD, 4-spd
3:5 Diff etc...
When we bought it, it wondered all over the road.
Wanted to go left and right at the same time...
Put her in a shop, they changed the wheel bearings
and the Rotors that were wore down past spects, with
pads and calipers and alignment.
Made a huge difference.
Was still having the problem and a couple years later
had the whole front end rebuilt.
All the Bushings, Tie Rods, drag Link, King pins,
steering Box, Springs and Shocks.
Was like a new truck.
Later I noticed she would pull like being on a rutted
road. Was told if I put the stock size tire on it, it would
probably go away. I was running 265/85 16, and stock
is 235/85 16. threw in a set and drives great. Probably
put on 50K miles or so since then.
When you buy and old 25 - 30 year old truck you`r
going to have to dump some money in them to replace
some of the wore out bullet proof parts.
I don`t know how some you guys can run some of
these tires that are a foot wide and not have problems.
Goat.